@class NSObject; @protocol OS_os_log, OS_dispatch_queue; @interface GTLoopbackService : NSObject <GTLoopbackService> { NSObject<OS_os_log> *_log; NSObject<OS_dispatch_queue> *_serialQueue; } - (id)init; - (void).cxx_destruct; - (id)echo:(id)a0; - (void)echo:(id)a0 completionHandler:(id /* block */)a1; - (void)echo:(id)a0 repeat:(unsigned long long)a1 callback:(id /* block */)a2; - (void)echo:(id)a0 repeat:(unsigned long long)a1 callback:(id /* block */)a2 complete:(id /* block */)a3; @end